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Pregnant. Took plan b after having sex with second partner. How to know the paternity?

Mar 2016
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i am pregnant.... i took plan b one step after a mistake with one person 2hours could be possible that i did it while pregnant already by a different person, or there a chance that the mistake is the father?
Posted Sat, 31 Aug 2013 in Pregnancy
Answered by Dr. S Patra 47 minutes later

Thanks for writing to us on XXXXXXX

As per your information, if you are already pregnant, then there is no chance for second time fertilization. For your information sake, two separate fertilization may occur with two different act of coitus from two different persons in the presence of one growing embryo in early weeks. This is called SUPERFETATION in medical term. However, it is extremely rare occurrence.

To clear confusion, I suggest to undergo one obstetric ultrasound scan after 4 weeks of accidental coitus to exclude second gestational sac (rarest). However, you took Plan B one step pill within 2 hrs & it will give you extra protection from development of second sac. In singleton pregnancy, there is no chance of being father for the 2nd person. Otherwise, one fetal DNA test is more conclusive. You can consult with your gynecologist regarding this.

Hope, above information is helpful to you. Let me know, if you need any further clarification.

Wish your good health. Good luck.

Dr Soumen
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